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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     * <a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     * <a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.lang3;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    /**<a name="line.19"></a>
<FONT color="green">020</FONT>     * &lt;p&gt;Operations on {@code CharSet} instances.&lt;/p&gt;<a name="line.20"></a>
<FONT color="green">021</FONT>     *<a name="line.21"></a>
<FONT color="green">022</FONT>     * &lt;p&gt;This class handles {@code null} input gracefully.<a name="line.22"></a>
<FONT color="green">023</FONT>     * An exception will not be thrown for a {@code null} input.<a name="line.23"></a>
<FONT color="green">024</FONT>     * Each method documents its behaviour in more detail.&lt;/p&gt;<a name="line.24"></a>
<FONT color="green">025</FONT>     * <a name="line.25"></a>
<FONT color="green">026</FONT>     * &lt;p&gt;#ThreadSafe#&lt;/p&gt;<a name="line.26"></a>
<FONT color="green">027</FONT>     * @see CharSet<a name="line.27"></a>
<FONT color="green">028</FONT>     * @since 1.0<a name="line.28"></a>
<FONT color="green">029</FONT>     * @version $Id: CharSetUtils.java 1144916 2011-07-10 17:50:21Z ggregory $<a name="line.29"></a>
<FONT color="green">030</FONT>     */<a name="line.30"></a>
<FONT color="green">031</FONT>    public class CharSetUtils {<a name="line.31"></a>
<FONT color="green">032</FONT>    <a name="line.32"></a>
<FONT color="green">033</FONT>        /**<a name="line.33"></a>
<FONT color="green">034</FONT>         * &lt;p&gt;CharSetUtils instances should NOT be constructed in standard programming.<a name="line.34"></a>
<FONT color="green">035</FONT>         * Instead, the class should be used as {@code CharSetUtils.evaluateSet(null);}.&lt;/p&gt;<a name="line.35"></a>
<FONT color="green">036</FONT>         *<a name="line.36"></a>
<FONT color="green">037</FONT>         * &lt;p&gt;This constructor is public to permit tools that require a JavaBean instance<a name="line.37"></a>
<FONT color="green">038</FONT>         * to operate.&lt;/p&gt;<a name="line.38"></a>
<FONT color="green">039</FONT>         */<a name="line.39"></a>
<FONT color="green">040</FONT>        public CharSetUtils() {<a name="line.40"></a>
<FONT color="green">041</FONT>          super();<a name="line.41"></a>
<FONT color="green">042</FONT>        }<a name="line.42"></a>
<FONT color="green">043</FONT>    <a name="line.43"></a>
<FONT color="green">044</FONT>        // Squeeze<a name="line.44"></a>
<FONT color="green">045</FONT>        //-----------------------------------------------------------------------<a name="line.45"></a>
<FONT color="green">046</FONT>        /**<a name="line.46"></a>
<FONT color="green">047</FONT>         * &lt;p&gt;Squeezes any repetitions of a character that is mentioned in the<a name="line.47"></a>
<FONT color="green">048</FONT>         * supplied set.&lt;/p&gt;<a name="line.48"></a>
<FONT color="green">049</FONT>         *<a name="line.49"></a>
<FONT color="green">050</FONT>         * &lt;pre&gt;<a name="line.50"></a>
<FONT color="green">051</FONT>         * CharSetUtils.squeeze(null, *)        = null<a name="line.51"></a>
<FONT color="green">052</FONT>         * CharSetUtils.squeeze("", *)          = ""<a name="line.52"></a>
<FONT color="green">053</FONT>         * CharSetUtils.squeeze(*, null)        = *<a name="line.53"></a>
<FONT color="green">054</FONT>         * CharSetUtils.squeeze(*, "")          = *<a name="line.54"></a>
<FONT color="green">055</FONT>         * CharSetUtils.squeeze("hello", "k-p") = "helo"<a name="line.55"></a>
<FONT color="green">056</FONT>         * CharSetUtils.squeeze("hello", "a-e") = "hello"<a name="line.56"></a>
<FONT color="green">057</FONT>         * &lt;/pre&gt;<a name="line.57"></a>
<FONT color="green">058</FONT>         *<a name="line.58"></a>
<FONT color="green">059</FONT>         * @see CharSet#getInstance(java.lang.String...) for set-syntax.<a name="line.59"></a>
<FONT color="green">060</FONT>         * @param str  the string to squeeze, may be null<a name="line.60"></a>
<FONT color="green">061</FONT>         * @param set  the character set to use for manipulation, may be null<a name="line.61"></a>
<FONT color="green">062</FONT>         * @return the modified String, {@code null} if null string input<a name="line.62"></a>
<FONT color="green">063</FONT>         */<a name="line.63"></a>
<FONT color="green">064</FONT>        public static String squeeze(String str, String... set) {<a name="line.64"></a>
<FONT color="green">065</FONT>            if (StringUtils.isEmpty(str) || deepEmpty(set)) {<a name="line.65"></a>
<FONT color="green">066</FONT>                return str;<a name="line.66"></a>
<FONT color="green">067</FONT>            }<a name="line.67"></a>
<FONT color="green">068</FONT>            CharSet chars = CharSet.getInstance(set);<a name="line.68"></a>
<FONT color="green">069</FONT>            StringBuilder buffer = new StringBuilder(str.length());<a name="line.69"></a>
<FONT color="green">070</FONT>            char[] chrs = str.toCharArray();<a name="line.70"></a>
<FONT color="green">071</FONT>            int sz = chrs.length;<a name="line.71"></a>
<FONT color="green">072</FONT>            char lastChar = ' ';<a name="line.72"></a>
<FONT color="green">073</FONT>            char ch = ' ';<a name="line.73"></a>
<FONT color="green">074</FONT>            for (int i = 0; i &lt; sz; i++) {<a name="line.74"></a>
<FONT color="green">075</FONT>                ch = chrs[i];<a name="line.75"></a>
<FONT color="green">076</FONT>                // Compare with contains() last for performance.<a name="line.76"></a>
<FONT color="green">077</FONT>                if (ch == lastChar &amp;&amp; i != 0 &amp;&amp; chars.contains(ch)) {<a name="line.77"></a>
<FONT color="green">078</FONT>                    continue;<a name="line.78"></a>
<FONT color="green">079</FONT>                }<a name="line.79"></a>
<FONT color="green">080</FONT>                buffer.append(ch);<a name="line.80"></a>
<FONT color="green">081</FONT>                lastChar = ch;<a name="line.81"></a>
<FONT color="green">082</FONT>            }<a name="line.82"></a>
<FONT color="green">083</FONT>            return buffer.toString();<a name="line.83"></a>
<FONT color="green">084</FONT>        }<a name="line.84"></a>
<FONT color="green">085</FONT>    <a name="line.85"></a>
<FONT color="green">086</FONT>        // Count<a name="line.86"></a>
<FONT color="green">087</FONT>        //-----------------------------------------------------------------------<a name="line.87"></a>
<FONT color="green">088</FONT>        /**<a name="line.88"></a>
<FONT color="green">089</FONT>         * &lt;p&gt;Takes an argument in set-syntax, see evaluateSet,<a name="line.89"></a>
<FONT color="green">090</FONT>         * and returns the number of characters present in the specified string.&lt;/p&gt;<a name="line.90"></a>
<FONT color="green">091</FONT>         *<a name="line.91"></a>
<FONT color="green">092</FONT>         * &lt;pre&gt;<a name="line.92"></a>
<FONT color="green">093</FONT>         * CharSetUtils.count(null, *)        = 0<a name="line.93"></a>
<FONT color="green">094</FONT>         * CharSetUtils.count("", *)          = 0<a name="line.94"></a>
<FONT color="green">095</FONT>         * CharSetUtils.count(*, null)        = 0<a name="line.95"></a>
<FONT color="green">096</FONT>         * CharSetUtils.count(*, "")          = 0<a name="line.96"></a>
<FONT color="green">097</FONT>         * CharSetUtils.count("hello", "k-p") = 3<a name="line.97"></a>
<FONT color="green">098</FONT>         * CharSetUtils.count("hello", "a-e") = 1<a name="line.98"></a>
<FONT color="green">099</FONT>         * &lt;/pre&gt;<a name="line.99"></a>
<FONT color="green">100</FONT>         *<a name="line.100"></a>
<FONT color="green">101</FONT>         * @see CharSet#getInstance(java.lang.String...) for set-syntax.<a name="line.101"></a>
<FONT color="green">102</FONT>         * @param str  String to count characters in, may be null<a name="line.102"></a>
<FONT color="green">103</FONT>         * @param set  String[] set of characters to count, may be null<a name="line.103"></a>
<FONT color="green">104</FONT>         * @return the character count, zero if null string input<a name="line.104"></a>
<FONT color="green">105</FONT>         */<a name="line.105"></a>
<FONT color="green">106</FONT>        public static int count(String str, String... set) {<a name="line.106"></a>
<FONT color="green">107</FONT>            if (StringUtils.isEmpty(str) || deepEmpty(set)) {<a name="line.107"></a>
<FONT color="green">108</FONT>                return 0;<a name="line.108"></a>
<FONT color="green">109</FONT>            }<a name="line.109"></a>
<FONT color="green">110</FONT>            CharSet chars = CharSet.getInstance(set);<a name="line.110"></a>
<FONT color="green">111</FONT>            int count = 0;<a name="line.111"></a>
<FONT color="green">112</FONT>            for (char c : str.toCharArray()) {<a name="line.112"></a>
<FONT color="green">113</FONT>                if (chars.contains(c)) {<a name="line.113"></a>
<FONT color="green">114</FONT>                    count++;<a name="line.114"></a>
<FONT color="green">115</FONT>                }<a name="line.115"></a>
<FONT color="green">116</FONT>            }<a name="line.116"></a>
<FONT color="green">117</FONT>            return count;<a name="line.117"></a>
<FONT color="green">118</FONT>        }<a name="line.118"></a>
<FONT color="green">119</FONT>    <a name="line.119"></a>
<FONT color="green">120</FONT>        // Keep<a name="line.120"></a>
<FONT color="green">121</FONT>        //-----------------------------------------------------------------------<a name="line.121"></a>
<FONT color="green">122</FONT>        /**<a name="line.122"></a>
<FONT color="green">123</FONT>         * &lt;p&gt;Takes an argument in set-syntax, see evaluateSet,<a name="line.123"></a>
<FONT color="green">124</FONT>         * and keeps any of characters present in the specified string.&lt;/p&gt;<a name="line.124"></a>
<FONT color="green">125</FONT>         *<a name="line.125"></a>
<FONT color="green">126</FONT>         * &lt;pre&gt;<a name="line.126"></a>
<FONT color="green">127</FONT>         * CharSetUtils.keep(null, *)        = null<a name="line.127"></a>
<FONT color="green">128</FONT>         * CharSetUtils.keep("", *)          = ""<a name="line.128"></a>
<FONT color="green">129</FONT>         * CharSetUtils.keep(*, null)        = ""<a name="line.129"></a>
<FONT color="green">130</FONT>         * CharSetUtils.keep(*, "")          = ""<a name="line.130"></a>
<FONT color="green">131</FONT>         * CharSetUtils.keep("hello", "hl")  = "hll"<a name="line.131"></a>
<FONT color="green">132</FONT>         * CharSetUtils.keep("hello", "le")  = "ell"<a name="line.132"></a>
<FONT color="green">133</FONT>         * &lt;/pre&gt;<a name="line.133"></a>
<FONT color="green">134</FONT>         *<a name="line.134"></a>
<FONT color="green">135</FONT>         * @see CharSet#getInstance(java.lang.String...) for set-syntax.<a name="line.135"></a>
<FONT color="green">136</FONT>         * @param str  String to keep characters from, may be null<a name="line.136"></a>
<FONT color="green">137</FONT>         * @param set  String[] set of characters to keep, may be null<a name="line.137"></a>
<FONT color="green">138</FONT>         * @return the modified String, {@code null} if null string input<a name="line.138"></a>
<FONT color="green">139</FONT>         * @since 2.0<a name="line.139"></a>
<FONT color="green">140</FONT>         */<a name="line.140"></a>
<FONT color="green">141</FONT>        public static String keep(String str, String... set) {<a name="line.141"></a>
<FONT color="green">142</FONT>            if (str == null) {<a name="line.142"></a>
<FONT color="green">143</FONT>                return null;<a name="line.143"></a>
<FONT color="green">144</FONT>            }<a name="line.144"></a>
<FONT color="green">145</FONT>            if (str.length() == 0 || deepEmpty(set)) {<a name="line.145"></a>
<FONT color="green">146</FONT>                return "";<a name="line.146"></a>
<FONT color="green">147</FONT>            }<a name="line.147"></a>
<FONT color="green">148</FONT>            return modify(str, set, true);<a name="line.148"></a>
<FONT color="green">149</FONT>        }<a name="line.149"></a>
<FONT color="green">150</FONT>    <a name="line.150"></a>
<FONT color="green">151</FONT>        // Delete<a name="line.151"></a>
<FONT color="green">152</FONT>        //-----------------------------------------------------------------------<a name="line.152"></a>
<FONT color="green">153</FONT>        /**<a name="line.153"></a>
<FONT color="green">154</FONT>         * &lt;p&gt;Takes an argument in set-syntax, see evaluateSet,<a name="line.154"></a>
<FONT color="green">155</FONT>         * and deletes any of characters present in the specified string.&lt;/p&gt;<a name="line.155"></a>
<FONT color="green">156</FONT>         *<a name="line.156"></a>
<FONT color="green">157</FONT>         * &lt;pre&gt;<a name="line.157"></a>
<FONT color="green">158</FONT>         * CharSetUtils.delete(null, *)        = null<a name="line.158"></a>
<FONT color="green">159</FONT>         * CharSetUtils.delete("", *)          = ""<a name="line.159"></a>
<FONT color="green">160</FONT>         * CharSetUtils.delete(*, null)        = *<a name="line.160"></a>
<FONT color="green">161</FONT>         * CharSetUtils.delete(*, "")          = *<a name="line.161"></a>
<FONT color="green">162</FONT>         * CharSetUtils.delete("hello", "hl")  = "eo"<a name="line.162"></a>
<FONT color="green">163</FONT>         * CharSetUtils.delete("hello", "le")  = "ho"<a name="line.163"></a>
<FONT color="green">164</FONT>         * &lt;/pre&gt;<a name="line.164"></a>
<FONT color="green">165</FONT>         *<a name="line.165"></a>
<FONT color="green">166</FONT>         * @see CharSet#getInstance(java.lang.String...) for set-syntax.<a name="line.166"></a>
<FONT color="green">167</FONT>         * @param str  String to delete characters from, may be null<a name="line.167"></a>
<FONT color="green">168</FONT>         * @param set  String[] set of characters to delete, may be null<a name="line.168"></a>
<FONT color="green">169</FONT>         * @return the modified String, {@code null} if null string input<a name="line.169"></a>
<FONT color="green">170</FONT>         */<a name="line.170"></a>
<FONT color="green">171</FONT>        public static String delete(String str, String... set) {<a name="line.171"></a>
<FONT color="green">172</FONT>            if (StringUtils.isEmpty(str) || deepEmpty(set)) {<a name="line.172"></a>
<FONT color="green">173</FONT>                return str;<a name="line.173"></a>
<FONT color="green">174</FONT>            }<a name="line.174"></a>
<FONT color="green">175</FONT>            return modify(str, set, false);<a name="line.175"></a>
<FONT color="green">176</FONT>        }<a name="line.176"></a>
<FONT color="green">177</FONT>    <a name="line.177"></a>
<FONT color="green">178</FONT>        //-----------------------------------------------------------------------<a name="line.178"></a>
<FONT color="green">179</FONT>        /**<a name="line.179"></a>
<FONT color="green">180</FONT>         * Implementation of delete and keep<a name="line.180"></a>
<FONT color="green">181</FONT>         *<a name="line.181"></a>
<FONT color="green">182</FONT>         * @param str String to modify characters within<a name="line.182"></a>
<FONT color="green">183</FONT>         * @param set String[] set of characters to modify<a name="line.183"></a>
<FONT color="green">184</FONT>         * @param expect whether to evaluate on match, or non-match<a name="line.184"></a>
<FONT color="green">185</FONT>         * @return the modified String, not null<a name="line.185"></a>
<FONT color="green">186</FONT>         */<a name="line.186"></a>
<FONT color="green">187</FONT>        private static String modify(String str, String[] set, boolean expect) {<a name="line.187"></a>
<FONT color="green">188</FONT>            CharSet chars = CharSet.getInstance(set);<a name="line.188"></a>
<FONT color="green">189</FONT>            StringBuilder buffer = new StringBuilder(str.length());<a name="line.189"></a>
<FONT color="green">190</FONT>            char[] chrs = str.toCharArray();<a name="line.190"></a>
<FONT color="green">191</FONT>            int sz = chrs.length;<a name="line.191"></a>
<FONT color="green">192</FONT>            for(int i=0; i&lt;sz; i++) {<a name="line.192"></a>
<FONT color="green">193</FONT>                if(chars.contains(chrs[i]) == expect) {<a name="line.193"></a>
<FONT color="green">194</FONT>                    buffer.append(chrs[i]);<a name="line.194"></a>
<FONT color="green">195</FONT>                }<a name="line.195"></a>
<FONT color="green">196</FONT>            }<a name="line.196"></a>
<FONT color="green">197</FONT>            return buffer.toString();<a name="line.197"></a>
<FONT color="green">198</FONT>        }<a name="line.198"></a>
<FONT color="green">199</FONT>    <a name="line.199"></a>
<FONT color="green">200</FONT>        /** <a name="line.200"></a>
<FONT color="green">201</FONT>         * Determines whether or not all the Strings in an array are <a name="line.201"></a>
<FONT color="green">202</FONT>         * empty or not.<a name="line.202"></a>
<FONT color="green">203</FONT>         *<a name="line.203"></a>
<FONT color="green">204</FONT>         * @param strings String[] whose elements are being checked for emptiness<a name="line.204"></a>
<FONT color="green">205</FONT>         * @return whether or not the String is empty<a name="line.205"></a>
<FONT color="green">206</FONT>         */<a name="line.206"></a>
<FONT color="green">207</FONT>        private static boolean deepEmpty(String[] strings) {<a name="line.207"></a>
<FONT color="green">208</FONT>            if (strings != null) {<a name="line.208"></a>
<FONT color="green">209</FONT>                for (String s : strings) {<a name="line.209"></a>
<FONT color="green">210</FONT>                    if (StringUtils.isNotEmpty(s)) {<a name="line.210"></a>
<FONT color="green">211</FONT>                        return false;<a name="line.211"></a>
<FONT color="green">212</FONT>                    }<a name="line.212"></a>
<FONT color="green">213</FONT>                }<a name="line.213"></a>
<FONT color="green">214</FONT>            }<a name="line.214"></a>
<FONT color="green">215</FONT>            return true;<a name="line.215"></a>
<FONT color="green">216</FONT>        }<a name="line.216"></a>
<FONT color="green">217</FONT>    }<a name="line.217"></a>




























































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